[ Raman op zoek naar leven ]
Organische mineralen snel in beeld te brengen
15 december 2009
Tim Snoek
25 reacties
2398x gelezen
Met een draagbare Raman-spectrometer kun je in het veld snel organische mineralen detecteren, en dat zou ook op Mars moeten kunnen. Dit schrijven Tsjechische onderzoekers in het
Journal of Raman Spectroscopy.

Volgens de onderzoekers is er een grote vraag naar het op een snelle en niet-destructieve manier detecteren van organische mineralen tijdens geologische expedities. Organische mineralen ontstaan wanneer organische zuren reageren met mineralen in aarde of steen, en als je ze bijvoorbeeld op Mars aantreft zou dat een ‘teken van leven’ kunnen zijn.
De onderzoekers brachten met zowel een draagbare Raman-spectrometer als een Raman-microspectrometer in het laboratorium, Raman-spectra van verschillene organische mineralen in beeld. Ze keken naar de meest intense Raman-banden van whewelliet (Ca(C2O4)?H2O), melliet (Al2C6(COO)6?16H2O en idrialiet (C22H14). Alle banden die met de outdoor-Raman werden verkregen, kwamen overeen met die van de literatuur en van de indoor-Raman-spectrometer. Ook in veldmonsters konden de mineralen gedetecteerd worden.
Aangezien een geminiaturiseerd Raman-instrument meegaat op toekomstige Mars-missies van de ESA en de NASA, raden de onderzoekers aan ook op de door hun onderzochte mineralen te screenen.
Bron: spectroscopyNOW.com
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